Improvement in non-corrosive metal-coated plate-holders



JAMES F. RYDER. Improvement in Non-Corrosive Metai-Coated Plate-Holders.

N0. 4,864. Patented May16,187l.

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JAMES F RYDER, OF-GLEVELAND, OHIO.

Letters Patent No. 114,864, dated May 16, 18.71.

IMPROVEMENT IN NON-CORRCSIVE METAL-COATED PLATE-HOLDEIdS.

The Schedule referred to in these Letter! Patent and making part of the same.

To all whom tt may concern:

Be it known that 1, Jules F. RYDER, of Cleveland, in the county of Onyahoga and State of Ohio, have invented a certain new a'ndimproved Non-Gorrosive Metal-Coated Plate-Holder; and I do hereby declare that the following is-a full, clear, and complete description of the same.

' The nature of this improvement relates to a photograph-plate holder, the frame of which is made of a base metal, and then coated with gold, silver, nickel, or other non-corrodible metal; or the said frame may be made partly of metal and wood or other suitable material, and then coated over wholly or in part with gold, silver,vor other non-corrodible metal, the object being to. make the frame cheap, light, and durable, and at the same time able to resist the action'of the acid in the uitrate-of-silver bath or solution usedin photography.

To more fully explain this improvement reference will be had to the annexed drawing making part of this specification, in which- Figure 1 is a section in the direction of the line a; as.

Figure 2 is a front view, with a part of the door removed.

This improyement is not confined to the plate-holder herein described, as itis applicable to others of different construction.

The one herein shown is provided with a hinged door, A, frame B, slide 0, and corner-piece D, for the usual purposes.

The frame is hollow, as indicated in fig. 1, and it may be made of wood or other suitable material or materials above the line E, and below this line of base metal suitable for this purpose, and the parts connected together by any suitable means, though the metal or wood, 850., portion of the frame may extend above or below said line E, as may be expedient; but in all cases the lower portion of the frame, is made of a base metal suitable foncoating with a non-corrodible metal, to prevent the base metal from being acted upon by the acid of the silver bath,

Plate-holders, as usually made, are ofwoou, and as there is more or less free acid in the silver solution the acid and the solution attack the fiber of the wood, soon rendering the holder worthless by destroying the integrity of the material of the frame. by the drippings from the plate when it is taken from the solution or bath and put into the frame. The silver solution, as it runs or drips of! the plate, comes in contact with the bottom of the frame at F and penetrates the wood and joints at the base of the holder, which soon causes it to be unfit for use. The upper parts of the holder are not affected to the same extent.

These evils and difficulties are effectually avoided by making thebase or lower part of the frame, which is the most exposed, of a metal that can be coated with anon-corrodible metal to resist the action of the acid in the nitrate-of-silver solution or other forms of solution for this purpose.

In case base or corrodible metal forms the lower part of the frame or holder, and not coated or covered to prevent oxidation by the action of the solution dripping from the plate, the coating upon the plate, when in the holder, is liable to be more or less affected or injured by the chemical action of the oxide of the metal of the frame'as it may be deposited upon the film of the plate by the drippings of the nitrate of silver. These difficulties are obviated by the use of my improvement.

Claim.

metallic covering, for the purpose set forth.

JAMES F. RYDER.

Witnesses: W. H. Bummer J. H. BURRIDGE.

This is caused, 

